class CreateSieves < ActiveRecord::Migration
  def self.up
    create_table :sieves do |t|
      t.column :parent_id, :integer
      t.column :date, :string
      t.column :field, :string
      t.column :predicate, :string
      t.column :target, :float
    end
  end

  def self.down
    drop_table :sieves
  end
end
